There is nothing in a bb30/pf30 system to maintain until it's time for a bearing replacement. The cranksets and bearings are the same for both systems. The difference is how the bearings fit the frame, and the size of the bottom bracket shell. PF30 systems seem to be a little easier on bearings due to the "plastic" bearing seats pressed into the frame. You'll know when it's replacement time. Spin the cranks when you pull the chain for maintenance. If it rumbles or doesn't spin smoothly, replace the bearings. Install a better bearing like an Abec5, using a good installation procedure and you're good to go. Until then just ride.